feat add Logics/Propositional/Defs#89
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Define propositions for propositional logic, including notation
⊥ ⊤ ⋏ ⋎ ⟶ ~for the logical connectives. ATheoryis a set ofProposition. Also defines minimal, intuitionistic and classical theories, and extensions of mapsAtom → Atom'to mapsProposition Atom → Proposition Atom'andTheory Atom → Theory Atom'.